code: def test_forward(self, dataloader_fname):
      with get_lightning_module() as lightning_module:
          dataloader = getattr(lightning_module, dataloader_fname)()
          batch = next(iter(dataloader))
          lightning_module(batch)
  
file_path: audio/test/torchaudio_unittest/example/emformer_rnnt/test_tedlium3_lightning.py
imports: from contextlib import contextmanager
  from functools import partial
  from unittest.mock import patch
  import torch
  from parameterized import parameterized
  from torchaudio._internal.module_utils import is_module_available
  from torchaudio_unittest.common_utils import skipIfNoModule, TorchaudioTestCase
  from .utils import MockCustomDataset, MockDataloader, MockSentencePieceProcessor
label_desc: Use image node_id 3 for calling the TestTEDLIUM3RNNTModule obj's underlying member method code with example usage: obj.test_forward(dataloader_fname) without return types